A champagne cork with its big rounded top and wide skirt of a base does nicely glued to the bottom of an ashtray or ceramic bowl (fancy or from Walmart). I always prefer to scoop out the bowl with the scoop end of a pipe nail, but I am of the minority that prefers not to build much cake, just leaving a thin layer of carbon. This does the job of cake but preserves the pipe nicely and eliminates the need for a reamer which, if used wrong, can do damage, slight or serious. After scooping, I wipe out the bowl with a paper napkin, paper towel, or tissue. Some of my 30 and 40 year old pipes "say" this suits them well.